package offer.tree;

class TreeNode {

    public String val = null;
    public TreeNode left = null;
    public TreeNode right = null;

    public TreeNode(String val) {
        this.val = val;
    }

    public TreeNode(String val,TreeNode left,TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }

}